Not sure but my system has a 230watt and its a p4w/ht, 1 hd, wireless card, dvd bruner, you know all the normal stuff nothing added extra really and it didnt have enough power for the card but I took it to a computer shop twice and they said thats not the problem...But it is. The reason I didnt put a new power supply in is becuase dell said it will overpower and ruin the system and that shop offers a guarantee on all work and others dont so I though that would be better so I dont risk ruining my computer. The shop tells me it wont do damage to the system but dell claims it does but anyways I think you should upgrade the power supply, maybe someone else on tech spot can tell you otherwise but mine didnt run right and I think 250 is the min but since you have an off board sound card and an added hard drive thats extra power usageand a floppy too my system doesnt even have a floppy. Heck it doesnt even hve ps/2 ports but thats a different story. So I think it would be smart to get a 400 watt power supply that should work just fine. or even a 350 watt. But if its genric that 400-500 watt or name brand like antec, thermaltake then 350watt